The above map is the result of a painstaking and admittedly quixotic effort to catalog the country as it has been described in the American road-tripping literature. It includes every place-name reference in 12 books about cross-country travel, from Mark Twain’s Roughing It (1872) to Cheryl Strayed’s Wild (2012), and maps the authors’ routes on top of one another. …To be included, a book needed to have a narrative arc matching the chronological and geographical arc of the trip it chronicles. It needed to be non-fictional, or, as in the case of On the Road, at least told in the first-person. To anticipate a few objections: Lolita’s road-trip passages are scattered and defiant of cartographical order; The Grapes of Wrath’s are brief compared to the sections about poverty and persecution in California; the length of the trip in Fear and Loathing in Las Vegas is short in the geographical sense even if it is prodigiously vast in every other; and yes, The Dharma Bums is On the Road’s equal in every respect, and if you want to map the place-name references in all of Kerouac’s books, I salute you.